Código PHP:
<?php
function maximo($tabla, $campo, $llave) {
$query = "SELECT MAX($campo) AS maximo FROM $tabla WHERE num_empleado = '$llave'";
$result = mysql_query($query);
$arr = mysql_fetch_array($result);
if($arr) {
$valor = $array['maximo'];
}
else {
$valor = 0;
}
return $valor;
}
?>
Gracias.